Importance prioritisation in JPEG 2000 for improved interpretability

摘要

Importance prioritised coding is an image coding principle aimed at improving the interpretability versus bit-rate performance of image coding systems. It is important in surveillance where image formats are large and transmission over bandlimited channels can take considerable time even for compressed bit-streams. It is also useful in content-based retrieval and browsing applications, where the number of images viewed tend to be large and faster interpretability would imply faster rejection of unwanted partially decompressed images. An importance prioritised image coder incorporated within the JPEG 2000 framework, called IMP-J2K, is presented, to prioritise image contents according to a metric based on its ‘importance’. The performance of IMP-J2K is also quantitatively assessed using the objective peak signal-to-noise ratio quality and subjective national imagery interpretability rating scale.